Timing stuck at 38

HI all,

Hoping someone can shed some light as I'm desperately out of my depth. My car is a 2004 Skoda Octavia 1.9 TDi 110 81kw asv 1u5.

After a head gasket replacement and timing belt change, I'm trying to set the timing using the graph in VCDS. No matter what I do with the pump, the graph will only show 38 and on the bottom it says "timing within spec: slightly retarded. Nothing I do changes that.

I have adjusted the pump to retarded where it won't start and advanced where it clatters. I've tried in between those points but can't change that graph from 38.

The car drives well enough but has some slight hesitation under 2000rpm but fine after that. Idle is a horrible, feels like the engine wants to shake itself out.

I believe my G81 fuel temp sensor is lazy so I'll be changing that when the triangle bolt tool arrives.

I had the injectors refurbed. I've tested the needle lift wire and get a resistance reading of 117 so that's fine from what I've read.

I have a very low injection quantity reading which bounces from 0 to under 2. I tried changing the adaptation number but that didn't make much difference. When I first looked it was set to 32668. I've read the iq number should be between 3 & 5 and the "hammer mod" may be required?

I've wondered if I'm a tooth out on the timing, but AI says the car wouldn't run if it was a tooth out.

Any ideas on where to look and what to check would be massively appreciated.

Cheers